Topper sailor Rian Collin of the host club leads the biggest fleet of the youth sailing national championships at Royal Cork Yacht Club.
After three races sailed, Collins, on four points, leads clubmate Dan O'Leary by an impressive ten points.
Howth's Ciara McMahon took third place in the 38-boat fleet on 17 points, some six points ahead of Northern Ireland Topper champion Bobby Driscoll of Royal Northern Ireland Yacht Club.